feat: support opentelemetry

[fatelei]

Description

fix #582

Type of Change

• Bug fix
• New feature
• Refactor
• Performance improvement
• Other

Essential Checklist

dify chain of dify-plugin-daemon

Testing

• I have tested the changes locally and confirmed they work as expected
• I have added unit tests where necessary and they pass successfully

Bug Fix (if applicable)

• I have used GitHub syntax to close the related issue (e.g., Fixes #123 or Closes #123)

Additional Information

Please provide any additional context that would help reviewers understand the changes.

[gemini-code-assist]

Summary of Changes

Hello @fatelei, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the application's observability by integrating OpenTelemetry. This enables detailed tracing and metric collection across key services, including HTTP communications, database interactions, and Redis caching. The changes allow for easier monitoring and debugging of the application's behavior, particularly within the local plugin runtime's Python environment setup, without requiring intrusive code modifications in many areas.

Highlights

• OpenTelemetry Integration: Introduced comprehensive OpenTelemetry support for enhanced observability, including tracing and metrics, across various components of the application.
• Configuration via Environment Variables: Added a suite of new environment variables in .env.example to configure OpenTelemetry settings such as endpoints, API keys, sampling rates, and batch export parameters.
• Automated Instrumentation: Implemented automatic instrumentation for HTTP clients (dify invocation, serverless connector), GORM database operations, Redis client interactions, and Gin HTTP server requests.
• Python Environment Tracing: Extended tracing capabilities to the local plugin runtime's Python environment initialization process, allowing for better visibility into dependency management and virtual environment setup.
• Dependency Updates: Updated numerous Go module dependencies to their latest versions, including OpenTelemetry specific libraries for Gin, HTTP, Redis, and GORM.

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[gemini-code-assist]

Code Review

This pull request introduces OpenTelemetry support for distributed tracing and metrics, enhancing observability across the application. Key changes include adding OpenTelemetry configuration to .env.example, integrating OTLP exporters for traces and metrics, instrumenting HTTP clients (dify invocation, serverless connector), GORM, and Gin with OpenTelemetry, and adding tracing to Python environment initialization steps. The changes are well-structured and provide a solid foundation for observability. However, there are a few areas for improvement regarding error handling, consistency in attribute naming, and potential for more granular control over tracing configuration.

[Stream29]

@Yeuoly It looks good to me.